CN208156201U - The device of power spectrum is obtained, power spectrum is obtained and the device of energy window is set - Google Patents
The device of power spectrum is obtained, power spectrum is obtained and the device of energy window is set Download PDFInfo
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- CN208156201U CN208156201U CN201820395440.5U CN201820395440U CN208156201U CN 208156201 U CN208156201 U CN 208156201U CN 201820395440 U CN201820395440 U CN 201820395440U CN 208156201 U CN208156201 U CN 208156201U
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Abstract
The utility model, which provides, to be obtained the device of power spectrum, obtain power spectrum and the device of energy window is arranged, the scintillation pulse signal that voltage comparator and detector module communication connection and pick-up probe module are sent；DAC and voltage comparator communicate to connect and are sent to it threshold information；The scintillation pulse signal for meeting threshold information is sent to counter by voltage comparator；Control connect with storage unit with counter and stores and records count information, and control also connect with DAC with storage unit and stores and records threshold information.The device that energy window is arranged includes two voltage comparators, two DAC, first DAC is connect with first voltage comparator, second voltage comparator and detector module communicate to connect, 2nd DAC is connect with second voltage comparator, digital unit is connect with detector module, and logic judgment unit is connect with two voltage comparators respectively.The cost and complexity of the systems such as PET, SPET can be effectively reduced in the utility model, reduce demand of the system to computing resource and time.
Description
Technical field
The utility model relates to radiation detection and digital imaging arts, relate more specifically to a kind of dress for obtaining power spectrum
Set, obtain power spectrum and be arranged the device of energy window.
Background technique
Positron emission tomography (positron emission tomography, abbreviation PET), single photon emission meter
The nuclear medicine shadows such as calculation machine tomographic imaging (single-photon emission computed tomography, abbreviation SPECT)
Whether occur as needing to measure the energy size information of incident gamma particle in equipment to screen when gamma particle passes through object
Cross Compton scattering.The energy size of gamma particle can not be measured directly, be usually converted into accordingly using scintillation detector
Electric impulse signal, measure electric impulse signal amplitude (or integrated value) size by way of obtain gamma particle energy it is big
It is small.It needs to carry out coefficient mark to amplitude (or integrated value) size of electric pulse and the energy size of particle in this acquisition process
It is fixed, find out electric pulse amplitude (or integrated value) corresponding to a certain energy.The energy size of the gamma particle detected then foundation
Pulse amplitude (or integrated value) size corresponding to it is converted to particle energy size by linear transformation by this coefficient.
The event that Compton scattering occurred usually passes through the suitable energy window of setting and is screened.During the screening process,
The acquisition of calibration coefficient is crucial.The coefficient is usually demarcated using power spectrum, by taking PET system as an example, Fig. 1 be PET system its
In a probe access be formed by energy spectrum diagram, wherein abscissa be electric pulse amplitude (or integrated value) size, ordinate
For event number, energy resolution is 11% in Fig. 1, energy peak 28190.Energy spectrum diagram according to Fig. 1 carries out coefficient calibration,
Calibration coefficient is 511keV/28190, and the energy size of gamma particle can be calculated by formula x × 511keV/28190,
Wherein x is the integrated value that gamma particle corresponds to electric pulse.If PET system carries out Compton using 350keV-750keV energy window
Event is screened, i.e. gal of the energy integrated value between 350keV/ (511keV/28190) and 750keV/ (511keV/28190)
Horse particle can be considered as directly reaching detector without Compton scattering.
In the prior art, the acquisition of energy spectrum diagram would generally be first with analog-digital converter (analog-to-digital
Converter, abbreviation ADC) collect and record each electric pulse in a period of time amplitude (or integrated value) size, then
Segmentation statistics is carried out according to the amplitude recorded and ultimately forms energy spectrum diagram.The setting of energy window in the prior art and Kang Pu
The examination for scattering events of pausing is then that linear transform coefficient is calibrated on the basis of above-mentioned power spectrum, and corresponding energy is then arranged
Window.The amplitude (or integrated value) for the electric pulse recorded is screened according to set energy window then, records and is located at
Event within the scope of energy window.
However, needing to acquire each electric pulse in a period of time in advance using high speed, high-precision ADC in the prior art
Amplitude (or integrated value), and the screening of energy window usually requires to carry out by software, can occupy certain computing resource with
Time, not only cost is larger, but also processing speed is not fast enough.
Utility model content
The purpose of the utility model is to provide a kind of device for obtaining power spectrum, obtains power spectrum and the device of energy window is set,
To solve the problems, such as that at high cost and processing speed is slow when obtaining power spectrum and setting energy window using ADC in the prior art.
In order to solve the above-mentioned technical problem, the device provided by the utility model for obtaining power spectrum, including：Voltage comparator,
The voltage comparator and detector module communicate to connect and receive the scintillation pulse signal that the detector module is sent；Number
Analog converter, the digital analog converter and the voltage comparator communicate to connect and send threshold to the voltage comparator
Value information；Counter, the counter are connect with the voltage comparator, and the voltage comparator will meet the threshold information
Scintillation pulse signal be sent to the counter；And control and storage unit, the control and storage unit and the meter
Number devices connects and store and record the count information from the counter, the control and storage unit also with the number
Analog converter connects and stores and records the threshold information of the digital analog converter.
One embodiment according to the present utility model, described device export number by the FPGA connecting with the counter
According to.
One embodiment according to the present utility model, the voltage comparator use low-voltage differential signal interface.
The device provided by the utility model for obtaining power spectrum and energy window being set, including：First voltage comparator, described
One voltage comparator and detector module communicate to connect and receive the scintillation pulse signal that the detector module is sent；First number
Word analog converter, first digital analog converter connect with the first voltage comparator and to the first voltage ratios
First threshold information is sent compared with device；Second voltage comparator, the second voltage comparator and the detector module communication link
Connect and receive the scintillation pulse signal that the detector module is sent；Second digital analog converter, second digital simulation
Converter connect with the second voltage comparator and sends second threshold information to the second voltage comparator；Digitlization is single
Member, the digital unit connect with the detector module and digitize the scintillation pulse signal；Logic judgment unit,
The logic judgment unit is connect respectively with the first voltage comparator and the second voltage comparator to receive and meet
The scintillation pulse signal of threshold condition, the logic judgment unit are connect simultaneously with the digital unit to export and meet threshold value
The digitlization scintillation pulse signal of condition；Threshold setting unit, the threshold setting unit respectively with first digital simulation
Converter and second digital analog converter connection are with sending threshold value setting information；And data packing/transmission unit,
Data packing/the transmission unit is connect with the logic judgment unit.
One embodiment according to the present utility model, described device with the data packing/transmission unit by connecting
FPGA exports data.
One embodiment according to the present utility model, described device further include main control unit, the main control unit with it is described
Threshold setting unit connection simultaneously sends setting instruction to the threshold setting unit.
One embodiment according to the present utility model, first, second voltage comparator use low-voltage differential signal
Interface.
The device for obtaining power spectrum, acquisition power spectrum and the device that energy window is set provided by the utility model, by setting one by one
Set threshold voltage and record the mode of corresponding data and realize the acquisition of gamma-spectrometric data, by threshold voltage compare in the way of realize health
The examination of general event, power spectrum obtain during avoid high speed, high-precision ADC use, can be effectively reduced PET,
The cost and complexity of the systems such as SPET；Meanwhile realized by way of threshold value comparison energy window examination, reduce PET,
Demand of the systems such as SPET to computing resource and time.
Detailed description of the invention
Fig. 1 is energy spectrum diagram acquired in some channel of PET system according to prior art；
Fig. 2 is the structural schematic diagram of the acquisition power spectrum of one embodiment according to the present utility model；
Fig. 3 is the structural representation of the acquisition power spectrum of one embodiment according to the present utility model and the device of setting energy window
Figure.
Specific embodiment
Below in conjunction with specific embodiment, the utility model is described further.It should be understood that following embodiment is only used for
The range that bright the utility model rather than limits the present invention.
Fig. 2 be according to the structural schematic diagram of the device of the acquisition power spectrum of one embodiment of the utility model, can by Fig. 2
Know, it includes voltage comparator 2, counter 3, digital analog converter (Digital that the power spectrum in the utility model, which obtains circuit,
To analog converter, abbreviation DAC) 4 and control and storage unit 5, wherein voltage comparator 2 and external detector
The scintillation pulse signal 1 that the connection of module (not shown) and pick-up probe module are sent, DAC4 are connect simultaneously with voltage comparator 2
To 2 sending threshold value information of voltage comparator, the sudden strain of a muscle that voltage comparator 2 connect with counter 3 and will be met according to threshold information
Bright pulse is sent to counter 3 and is counted, and counter 3 connect with storage unit 5 with control and count information is sent to control
System and storage unit 5, in addition, DAC4 is connect to receive the number of threshold values of control and the transmission of storage unit 5 with control with storage unit 5
According to.In addition, counter 3 in the utility model can be connect with external FPGA (not shown) or data equipment leading out with
It displays data or handles.
When carrying out power spectrum acquisition using device shown in Fig. 2, the dynamic range of DAC4 requires more than the amplitude model of scintillation pulse
It encloses.The amplitude range of scintillation pulse 1 is denoted as 0-H millivolts, the dynamic range of DAC4 is denoted as 0-J millivolts, and J and H are positive number, J
Greater than H, then the method that power spectrum and setting energy window are obtained in the utility model includes the following steps：
Step S1：E is set by the threshold value of DAC4nAnd by counter O reset；
Step S2：The amplitude that scintillation pulse 1 in T time section is recorded using counter 3 is more than EnUmber of pulse x1, and should
Data record is Nn；
Step S3：E is set by the threshold value of DAC4n-1=En- LSB, wherein LSB (least significant bit)
For the least significant bit of DAC4, recording the amplitude of scintillation pulse 1 in T time section after counter 3 is reset is more than En-1Pulse
Number x2, and be N by the data recordn-1=x2-Nn；
Step S4：E is set by the threshold value of DAC4n-2=En-1- LSB is recorded after resetting counter 3 and is dodged in T time section
The amplitude of bright pulse 1 is more than En-2Umber of pulse x3, and be N by the data recordn-2=x3-Nn-1；
Step S5：Step S4 is repeated, until Em=0.
In above-mentioned steps S1, the threshold value of DAC can be set as needed as any value between 0-J millivolts.In this field
Concrete practice in, preferably by EnIt is set as the numerical value not less than H, for example, if the amplitude range of scintillation pulse 1 is between 0-
Between 500 millivolts, then preferably by EnIt is set as 500 millivolts.
In above-mentioned steps S2, the value range of T is between 1 millisecond and 1 second, it is preferable that T takes 10 milliseconds, 20 millis
Second, 30 milliseconds or 40 milliseconds.
According to above-mentioned steps, N will form one 1024 (2 10 powers) length by control and the record of storage unit 5
One digit number group, wherein NnNumerical value indicate the unit time in scintillation pulse amplitude between EnAnd En+1Umber of pulse in range.It will
After the data export recorded in control and storage unit 5, with EnFor abscissa, NnThe curve drawn by ordinate is energy
Spectral curve.With the energy size of the amplitude size characterization particle of scintillation pulse in the power spectrum acquisition process.
Particularly, when carrying out Spectrum acquisition, if penetrating, source half-life period is shorter, needs to carry out attenuation coefficient to the N recorded
Correction.
In addition, the setting of threshold value can also need not be arranged one by one at equal intervals in above-mentioned power spectrum obtaining step, it can feel emerging
The threshold value of relatively closely spaced, the threshold value of other region setting larger spaces are set at interesting region (such as photoelectricity deposition peak).
A specific embodiment according to the present utility model, the amplitude range of scintillation pulse are 0-500 millivolts, DAC 10
Position precision and dynamic range is between 0-1000 millivolts, the LSB=1000/2 of the DAC at this time10Volt, using the above method and
It is as follows that device obtains the step of power spectrum：
Step S1：1000 millivolts are set by the threshold value of DAC and by counter O reset.
Step S2：It is more than the umber of pulse x of E using scintillation pulse amplitude in 1 millisecond of period of counter records1, and should
Data record is Nn；
Step S3：E is set by the threshold value of DACn-1=(1000-1000/1024) millivolt, will record 1 after counter O reset
The amplitude of scintillation pulse is more than E in the millisecond periodn-1Umber of pulse x2, and be N by the data recordn-1=x2-Nn；
Step S4：E is set by the threshold value of DACn-2=En-1- LSB is recorded after resetting counter 3 and is dodged in T time section
The amplitude of bright pulse 1 is more than En-2Umber of pulse x3, and be N by the data recordn-2=x3-Nn-1；
Step S5：Step S4 is repeated, until Em=0.
Fig. 3 is the structural representation according to the device of the acquisitions power spectrum and setting energy window of the utility model another embodiment
Figure, from the figure 3, it may be seen that the device of the acquisition power spectrum of the utility model and setting energy window includes digital unit 20, first voltage ratio
Compared with device 30, second voltage comparator 40, logic judgment unit 50, data storage/transmission unit 60, the first DAC70, second
DAC80, threshold setting unit 90 and main control unit 100, wherein two voltage comparators 30,40 can be believed by low voltage difference
Number, i.e. low-voltage differential signaling, the digital difference signals interface such as abbreviation LVDS substitution；In Fig. 3
Embodiment in, detector module (not shown) send scintillation pulse signal 10 be respectively connected to digital unit 20, first
Voltage comparator 30 and second voltage comparator 40, scintillation pulse signal carry out simulation numeral in digital unit 20 and turn
It changes, subsequently inputs logic judgment unit 50；First DAC70 connect with first voltage comparator 30 and to first voltage comparator
30 send opposite high threshold information；2nd DAC80 connect with second voltage comparator 40 and sends out to second voltage comparator 40
Send opposite Low threshold information, first voltage comparator 30 and second voltage comparator 40 respectively with external detector module
Connect the scintillation pulse signal 10 that simultaneously pick-up probe module is sent, while first voltage comparator 30 and second voltage comparator
40 by the comparison result input logic judging unit 50 of scintillation pulse signal and corresponding threshold value；Logic judgment unit 50 is according to two
The result (lower and upper limit that two results respectively correspond energy window) of voltage comparator 30,40, it is determined whether digitlization is single
The digital signal frame of 20 output of member abandons or is transmitted to subsequent data packing/transmission unit 60, data packing/transmission unit 60
It will further be exported after data preparation.In addition, main control unit 100 connects threshold setting unit 90 and is arranged to threshold value single
Member 90 sends setting instruction, and threshold setting unit 90 connect with the first DAC70, the 2nd DAC80 respectively and exports threshold value to it and sets
Confidence breath.Data packing/transmission unit 60 in the utility model can be exported with external FPGA (not shown) or data
Equipment is connected to display data or handle.
The device shown in Fig. 3 for obtaining power spectrum and energy window being arranged, the power spectrum that can be used for scintillation pulse obtain, it can also be used to
The energy window setting and screening, difference between the two of scintillation pulse are that, when obtaining for power spectrum, main control unit 100 is every
Every certain time change threshold value setting, the count number under different threshold values is acquired；When being arranged for energy window with screening, master control list
Member 100 does not modify to threshold value, and entire module acquires the scintillation pulse signal within the scope of certain energy upper and lower limit, will flash
Pulse signal digital simultaneously carries out transmission preparation outward.
The device for obtaining power spectrum, acquisition power spectrum and the device that energy window is set provided by the utility model, by setting one by one
Set threshold voltage and record the mode of corresponding data and realize the acquisition methods of gamma-spectrometric data, by threshold voltage compare in the way of it is real
The examination of existing Compton event avoids high speed, high-precision ADC use during power spectrum obtains, can be effectively reduced
The cost and complexity of the systems such as PET, SPET；Meanwhile energy window examination is realized by way of threshold value comparison, it reduces
Demand of the systems such as PET, SPET to computing resource and time.
Above-described, the only preferred embodiment of the utility model is not intended to limit the scope of the utility model, this
Above-described embodiment of utility model can also make a variety of changes.I.e. all claims according to the present utility model application and
Simple, equivalent changes and modifications, fall within the claims of the utility model patent made by description.This
The not detailed description of utility model is routine techniques content.
Claims (7)
1. a kind of device for obtaining power spectrum, which is characterized in that described device includes：
Voltage comparator, the voltage comparator and detector module communicate to connect and receive the sudden strain of a muscle that the detector module is sent
Bright pulse signal；
Digital analog converter, the digital analog converter communicated to connect with the voltage comparator and to the voltage compared with
Device sending threshold value information；
Counter, the counter are connect with the voltage comparator, and the voltage comparator will meet the threshold information
Scintillation pulse signal is sent to the counter；And
Control and storage unit, the control connect with the counter with storage unit and store and record from the meter
The count information of number device, the control also connect with the digital analog converter with storage unit and store and record the number
The threshold information of word analog converter.
2. the device according to claim 1 for obtaining power spectrum, which is characterized in that described device with the counter by connecting
The FPGA export data connect.
3. the device according to claim 1 for obtaining power spectrum, which is characterized in that the voltage comparator is poor using low-voltage
Sub-signal interface.
4. a kind of device for obtaining power spectrum and energy window being arranged, which is characterized in that described device includes：
First voltage comparator, the first voltage comparator and detector module communicate to connect and receive the detector module
The scintillation pulse signal of transmission；
First digital analog converter, first digital analog converter connect with the first voltage comparator and to described
First voltage comparator sends first threshold information；
Second voltage comparator, the second voltage comparator and the detector module communicate to connect and receive the detector
The scintillation pulse signal that module is sent；
Second digital analog converter, second digital analog converter connect with the second voltage comparator and to described
Second voltage comparator sends second threshold information；
Digital unit, the digital unit connect with the detector module and digitize the scintillation pulse signal；
Logic judgment unit, the logic judgment unit is respectively compared with the first voltage comparator and the second voltage
To receive the scintillation pulse signal for meeting threshold condition, the logic judgment unit connects with the digital unit simultaneously for device connection
It connects to export the digitlization scintillation pulse signal for meeting threshold condition；
Threshold setting unit, the threshold setting unit respectively with first digital analog converter and it is described second number
Analog converter is connected with sending threshold value setting information；And
Data packing/transmission unit, the data packing/transmission unit are connect with the logic judgment unit.
5. it is according to claim 4 obtain power spectrum and be arranged energy window device, which is characterized in that described device by with
The data packing/transmission unit connection FPGA exports data.
6. the device according to claim 4 for obtaining power spectrum and energy window being arranged, which is characterized in that described device further includes
Main control unit, the main control unit connect with the threshold setting unit and send setting instruction to the threshold setting unit.
7. the device according to claim 4 for obtaining power spectrum and energy window being arranged, which is characterized in that described first, second
Voltage comparator uses low-voltage differential signal interface.
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| CN201820395440.5U CN208156201U (en) | 2018-03-22 | 2018-03-22 | The device of power spectrum is obtained, power spectrum is obtained and the device of energy window is set |
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| CN201820395440.5U CN208156201U (en) | 2018-03-22 | 2018-03-22 | The device of power spectrum is obtained, power spectrum is obtained and the device of energy window is set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169789A (en) * | 2018-03-22 | 2018-06-15 | 苏州瑞迈斯医疗科技有限公司 | A kind of method, apparatus for obtaining power spectrum and the device that energy window is set |
| CN110954938A (en) * | 2019-12-11 | 2020-04-03 | 湖北锐世数字医学影像科技有限公司 | Threshold correction method and device of comparator and sampling circuit |
-
2018
- 2018-03-22 CN CN201820395440.5U patent/CN208156201U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169789A (en) * | 2018-03-22 | 2018-06-15 | 苏州瑞迈斯医疗科技有限公司 | A kind of method, apparatus for obtaining power spectrum and the device that energy window is set |
| CN108169789B (en) * | 2018-03-22 | 2023-09-05 | 苏州瑞迈斯科技有限公司 | Method and device for acquiring energy spectrum and device for setting energy window |
| CN110954938A (en) * | 2019-12-11 | 2020-04-03 | 湖北锐世数字医学影像科技有限公司 | Threshold correction method and device of comparator and sampling circuit |
| CN110954938B (en) * | 2019-12-11 | 2021-08-31 | 湖北锐世数字医学影像科技有限公司 | Threshold correction method and device of comparator and sampling circuit |
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Address after: Room 201-1, North building, No.17 building, No.8 Jinfeng Road, high tech Zone, Suzhou City, Jiangsu Province Patentee after: Suzhou Ruimeisi Technology Co.,Ltd. Address before: Room 201-1, North building, No.17 building, No.8 Jinfeng Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: SUZHOU RUIMAISI MEDICAL TECHNOLOGY Co.,Ltd. |
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